Locomotive provided with tubular air preheaters



Dec. 18,1923. 11,477,968

F. LJUNGSTRGM LOCOMOTIVE PROVIDED WITH TUBULAR AIR PREHEATERS Filed Aug. 21. 1922 II n n n Patented Dec. 118, i923..

U'NHTED TATE taunts career @FFHQE.

ERIE-ERIK LJ'UNGS'lRM, F LIDINGO-BREVIK, SWEDEN, ASSIGNOR T0 AIKTIEBOLAGET IQJ'UNGSTRbMS ANGTURBIN, OF STOCKHOLM, SWEDEN, A CDRPQRATION.

IAIJCOlliIO'lIVE PROVIDED WITH TUBULAR AIR PREHEATERS.

Application filed August 21, 1922. Serial No. 583,453.

To all whom it may concern.

Be it knownthat I, FREDRIK LeonosTRoM, a subject of the King. of Sweden, residing at Lidingo-Brevik, Sweden, have in- 6 vented certain new and useful Improvements in Locomotives Provided with Tubular Air Preheaters, of which the following is a specification.

In locomotives it has previously been proposed to utilize the heat of the waste gases exhausted from the boiler in .a preheater preheating the air sup-plied to the furnace, whereby the temperature of the waste gases is lowered considerably and at E the same time a better combustion in the furnace'is effected, the efiicacy of the steam boiler thus being increased andthe magnitude of the aggregate reduced for a (ertain quantit of steam. These preheaters have general y been located about the boiler or its smoke box. In such case it has particularly been suggested to place the tubes of the air-preheater in the longitudinal direction of the boiler and to locate them altogether or in part in front of the boiler beneath the smokebox in such manner that sweeping and removal of the tubes of the boiler may be effected without the preheater being any obstacle thereto. It has preheater according to the counter-current principle, the waste gases flowing about tubes through which the air to be preheated is passing.

o realize this counter-current principle the waste gases have to be admitted to rear part of the air-prehea'ter and on account thereof the air pro-heater is to be placed altogether in front of the steam boiler, the rear part of the prehea'ter beingin close connection to the smoke box. Such aloca air-preheater useful even in locomotives having. a short smoke box and consists in that the air-preheater extends also beneath also been proposed to construct such an air-' the steam boiler, the end of the preheater situated beneath the boiler being connected by means of a channel conducting the waste gases 'With the smoke box situated in front of the steam boiler.

The accompanying drawings illustrate diagrammatically two embodiments of the invention. Fig. 1 is a side view and in part a section of the fore part of a locomotive constructed accordin'g to the invention. Fig. 2 is a section of-the fore part of a locomotive in a modified form. Fig. 3 is a section of the air-preheater shown in Fig. 2. Fig. 4 are sections, in the right part of the figure on the line AA. in Fig. 2 and in the left part on line BB in same figure. Fig. 5 is a section on line C-C in Fi 2.

Referring to the drawings, 1 designates the steam boiler, 2 the furnace and 3 the smoke box which by means of the partition 4 is divided into two parts 5 and 6. 11 des igna'tes the air-'p-reheater having the tubes 1 12, 14 the chimney of the locomotive and 16 a channel leading to the furnace 2.

In the embodiment shown in Fig. 1 the waste gases are admitted to the rear part 5 of the smoke box and then conducted through the channel 7 in the direction of the arrow 8 to that end 9- of the air-pre heater 11 which is situated beneath the steam boiler 1, the waste gases then passing in the direction of the arrow 10 into the air-preheater 11 about its tubes 12. After having passed through the air-preheaterll and being cooled in the same,'the waste gases are conducted in the direction of the arrow 18 to the fore part 6 of the smoke box and then exhausted through the chimney 14c of the'locomotive to the atmosphere. The air to be preheated is sucked in by the draught in the furnace or on account of the speed of the train through the tubes 12 in the direction of the arrow 19, it being possible to increase the draught in the furnace in wellknown manner 10 means of fan device or the like preferab y placed in the fore part of the smoke box. The air, after having passed the tubes 12 and beingheated in the same, is conducted in the direction of the arrow 17 through the channel 16 below the- -grate to the furnace 2.

In the embodiment shown in Figsr2, 3, i 4: and 5 the waste gases enter the rear compartment 5 of the smoke box 3 and are then 1 are reversed according to the arrows 23 and 24 and pass then the two halves 25 and 26 of the air-preheater about the tubes 12. Then the waste gases are exhausted, as described above, in the direction of the arrows 27, 28 and 29 to the fore part 6 of the smoke box and through the chimney 14 to the atmosphere. The air to be preheated passes, as in the embodiment described above, in

the direction of the arrows 15 through the tubes 12 and is then conducted through the channel 16 to the furnace. As will appear from Fig. 5 the air-preheater is connected in well-known manner with a sweeping device 32 for the tubes. 33 designates a soot and ash collector of known type for airpreheaters.

The detail constructions and arrangements previously proposed in air-preheaters of other type than that described above may also be applied to constructions according to this invention, and other embodiments than those described above may be conceived without deviating from the principles of the invention.

What I claim as new and desire to secure by Letters Patent of'the United States is 1. In locomotives and similar carriages the combination with a steam boiler, a smoke box arranged in front of the boiler and a tubular air-preheater, the tubes of .which are situated in the longitudinal direction of the boiler, said air-preheater being arranged beneath the smoke box as well asbeneath the boiler of a channel conducting waste gases from, the boiler, the one end of said channel communicating with the smoke box,

whereas the other end thereof communicateswith that end of the air-preheater which is situated beneath theboiler.

2. In locomotives and similar carria es the combination with a steam boiler, a smo e rection to the box arranged in front of the boiler and a tubular air-preheater, the tubes of which are ing arranged above "the tubes of the airpreheater. a

3. In locomotives. and similar carriages the combination with a steam boiler, a smoke box arranged in front of the boiler and a tubular air-preheater, the tubes of whichv are situated in the longitudinal direction of the boiler, said air-preheater being arranged" beneath the smoke box as well as beneath the boiler ofa: channel conducting waste gases from the boiler, the one end of said channel conimunicating with the smoke box, whereas the other end thereof communicates with that end of the air-preheater which is situated beneath the boiler, the

tubes of the air-preheater being located at either side of said channel i 4. In locomotives and simllar carriages the combination with a steam boiler,a smoke box arranged in front of, the boiler and a tubular air-preheater, the tubes of which are situated in the 'longitudinald1rection of the boiler, said air-preheater bemg arranged beneath the smoke box as well as beneath the A boiler of a channel conducting waste gases fromthe boiler, the one end of said channel communicating with the smoke box, whereas the other end thereof communicates with that end of the air-preheater which is situated beneath the boiler, the waste gases passing through the airpreheater around the tubes in opposite dipassage of said gases through the channel. 7

In testimony whereof I afiix my signature in presence of two witnesses.

FREDRIK LJUNGSTROM. Witnesses:

L; BERG VON QUIALE,

SVEN FALK.

ommunicates with; that end of the air-preheater which is: I

situated beneath the boiler, said channel be- 

